A lava rose is a rare drip formation found
on floors, with a rose-like appearance. It is a form of drip stalagmite,
but instead of driblets, sheets of molten lava fall. Roses may also form,
instead, from upwelled lava boiling up out
of a partially solidified floor. Boiling of cooling (segregated) lava
is probably what propels the upwelling.